Features:Light sensor,ambient light darker,stronger light lighting.Shock sensor,when light turn off,go on riding,the light will turn on,if you forget to turn off the light,after 3 minuters,it will be turn off itself.Power save,aurora mode can be used continuously for 2 hours and power saving mode Release 6 hours.Safety,no glare, accident prevention.Cutoff line design,according to the German StVZO bicycle headlight authenticate.USB charging,easy to use.Easy to install,anti-fall protection.Recommended use for night riding,mountain bike,fixed gear bike and so on